linux-kernel - Re: [PATCH v2 4/5] drm/panel: panel-simple: Add function to look panel data up

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Message-ID: <8734blczuc.fsf@minerva.mail-host-address-is-not-set>
Date: Fri, 27 Jun 2025 11:12:43 +0200
From: Javier Martinez Canillas <javierm@...hat.com>
To: Maxime Ripard <mripard@...nel.org>, Neil Armstrong
 <neil.armstrong@...aro.org>, Jessica Zhang <quic_jesszhan@...cinc.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Thomas Zimmermann
 <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter
 <simona@...ll.ch>, Luca Ceresoli <luca.ceresoli@...tlin.com>, Anusha
 Srivatsa <asrivats@...hat.com>, Francesco Dolcini <francesco@...cini.it>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, Maxime
 Ripard <mripard@...nel.org>
Subject: Re: [PATCH v2 4/5] drm/panel: panel-simple: Add function to look
 panel data up

Maxime Ripard <mripard@...nel.org> writes:

> Commit de04bb0089a9 ("drm/panel/panel-simple: Use the new allocation in
> place of devm_kzalloc()") moved the call to drm_panel_init into the
> devm_drm_panel_alloc(), which needs a connector type to initialize
> properly.
>
> In the panel-dpi compatible case, the passed panel_desc structure is an
> empty one used as a discriminant, and the connector type it contains
> isn't actually initialized.
>
> It is initialized through a call to panel_dpi_probe() later in the
> function, which used to be before the call to drm_panel_init() that got
> merged into devm_drm_panel_alloc().
>
> So, we do need a proper panel_desc pointer before the call to
> devm_drm_panel_alloc() now. All cases associate their panel_desc with
> the panel compatible and use of_device_get_match_data, except for the
> panel-dpi compatible.
>
> In that case, we're expected to call panel_dpi_probe, which will
> allocate and initialize the panel_desc for us.
>
> Let's create such a helper function that would be called first in the
> driver and will lookup the desc by compatible, or allocate one if
> relevant.
>
> Reported-by: Francesco Dolcini <francesco@...cini.it>
> Closes: https://lore.kernel.org/all/20250612081834.GA248237@francesco-nb/
> Fixes: de04bb0089a9 ("drm/panel/panel-simple: Use the new allocation in place of devm_kzalloc()")
> Signed-off-by: Maxime Ripard <mripard@...nel.org>
> ---

Reviewed-by: Javier Martinez Canillas <javierm@...hat.com>

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat